Step 1: Open windows explorer then click on ToolsStep 2: Go to Folder OptionsStep 3: Click on the View Tab.Step 4: Scroll to the bottom and uncheck the option that reads "Use Simple File Sharing"Step 5: This will allow you to see the security tab when viewing the properties of a file/folder.

Note that this will only work on Windows XP Professional. In Windows XP Home Edition, you will have to go into Safe Mode and do this.